1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
package image
import (
"fmt"
"reflect"
"sync"
)
// Factory builds a provider instance.
type Factory[C any] func(C) (ImageProvider, error)
// Config exposes the configured image provider name.
type Config interface {
ImageProviderName() string
}
// Registry resolves provider names to factories.
type Registry[C Config] struct {
mu sync.RWMutex
factories map[string]Factory[C]
}
// NewRegistry creates an empty provider registry.
func NewRegistry[C Config]() *Registry[C] {
return &Registry[C]{factories: make(map[string]Factory[C])}
}
// Register associates name with a factory. Later registrations replace earlier ones.
func (r *Registry[C]) Register(name string, factory Factory[C]) {
if r == nil || factory == nil {
return
}
normalized := NormalizeName(name)
if normalized == "" {
return
}
r.mu.Lock()
defer r.mu.Unlock()
if r.factories == nil {
r.factories = make(map[string]Factory[C])
}
r.factories[normalized] = factory
}
// Resolve returns the factory registered for name.
func (r *Registry[C]) Resolve(name string) (Factory[C], bool) {
if r == nil {
return nil, false
}
r.mu.RLock()
defer r.mu.RUnlock()
factory, ok := r.factories[NormalizeName(name)]
return factory, ok
}
// New constructs a provider for name.
func (r *Registry[C]) New(name string, cfg C) (ImageProvider, error) {
var zero ImageProvider
factory, ok := r.Resolve(name)
if !ok {
return zero, fmt.Errorf("%w: %s", ErrUnknownProvider, name)
}
return factory(cfg)
}
// NewFromConfig resolves the provider name from cfg and constructs it.
func (r *Registry[C]) NewFromConfig(cfg C) (ImageProvider, error) {
if isNilValue(cfg) {
return nil, fmt.Errorf("image config is required")
}
return r.New(cfg.ImageProviderName(), cfg)
}
func isNilValue[T any](value T) bool {
v := reflect.ValueOf(value)
if !v.IsValid() {
return true
}
switch v.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Pointer, reflect.Slice:
return v.IsNil()
default:
return false
}
}
|
